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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7eb1e50defa748f262ce71bd0fd5c76b7d45a86bed606bd2b2de2bfd5bd727' 
  AND token = '/Vdd1sg+Ks7EfXkQFM66ML9lMV4WyRhAUqVyhOGQ3Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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