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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f8f0515280b8eff0360dd3cac387bb46afa266a5e6fa03cf5aad2449cb8088' 
  AND token = '4e7kGVWSyGfGuj3rWx729ws08y6kxFoEe4Lg6/Q0tx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}