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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc023069113bbcdbe1c7d51d77d7b5c1986e966a4799ad3e42531cd676a0c1ff' 
  AND token = 'e8Khes+dm1VTwcMN4LVd0ny2Vz5Q8H9zm+GX/XDc2D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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