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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6092eb66e375ac6b9add675bf93fb2baa63feb401f71ce387746ecabd43f6526' 
  AND token = 'G96S1371MExxKPDjNlS7jZkJA87YwBqoMJrPQUQMwXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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