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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40bcb0e06fdfaf97971350d31148fc50290580864ad87cc5e9fb294e78b3fbf' 
  AND token = 'TRoNsJRPUdEWLa+4pBgaSwD5h1wZE9rOj8GN1c4eU7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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