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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e468291eeda6397a0e6c72cf1471ac3c8408de89080abf9be647d0463c3c723' 
  AND token = 'wt5dTq/capDtn6EGMnCOctWJAELPRVnMt0P4kebD2lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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