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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09ee3f0692d0e762435d6e20d9564ea636a3696f10d5fcfa7b0c04d6fc22eef' 
  AND token = 'KUV13CV5tIEe7KkBtQJUKoIcR8nlEvnhHgKOq8uzhCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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