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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b994bbe42730552267022000fe1e4ef7d7fd5c64fd7b48ba8091959857d7f6' 
  AND token = 'Ra6Jf8rjjD/wtCVP8POwHWez5iHN7yOuWuC2RV1SdSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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