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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a8eb20fcb2e6fc9595746ac06cc0975940cece931b5f1bfa389713c1347593' 
  AND token = '3h9QGjGxo7YS6k/3gt0TUzafe4vOdTPl/vFnd9gDTZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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