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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a19943e835b074015d175d4d51e73aa27bbe74912edefb80a89297a7157248' 
  AND token = 'X2VxpJf3wzG7o4lWjExYYEgN4RPEnZlaYX+9rr260O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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