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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2079b729e4ebaf6c246b8f6da795be568f471c3e0a8eb49622a42c9ffeab65e3' 
  AND token = 'JTuUlhHrIrrqkE+9NrCelwhEtAT7dRt1aFupsWJq7a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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