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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd214c0bbb046ee0565e0767ebd570a1c021edd84287985a508594369b755516a' 
  AND token = 'dZC79j72Bmqxe9LM0zMXwMo2RlgOB7zlyyJ7k18fsQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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