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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1fb66e7c5ccaca2ac043e2656f30023eceedc9520855c0ae68c81283a8d817' 
  AND token = 'hc05f2jE+CK29SN/ErQFIzQKM2/TaXIQw5VgG5o27sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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