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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb8657ee59f5bcdf361892067f2e63dcdb068ca539123881aff0547e7e2f936' 
  AND token = 'IjPLsPQpPHj0gcsvaOsx26z7PYuc7batIH2hS9wy4+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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