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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6d8a8cae2fbe543b09e17330e737fa4b1baa41fe0cd1a4590a63b2ae8f9da8' 
  AND token = '1v9UMahiP4rrylPv+oqIeC5qjeovNtLnCeMS8FDbpog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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