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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09af6d7eb49f92b213ef7b56314eefd96597649c4884e19a1796a0a7b058c83' 
  AND token = 'Ud+c5S1u2D2OE5N1bX3II497Ic5fFmFfeSCT1g4ABcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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