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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0426d7c585add15c053eb69d3ecd96bc6b48c431ffe10706e85af592baf36c03' 
  AND token = 'G4be+IHADEBN3T/jttsSlHZG7Jl2gMktIPemv0XPmiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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