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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6e3926f61c6ccd3ae54c8a98d7e7f0d55a663c308bbc2151bf5c9fb82958bc' 
  AND token = 'ieCqDByWUaw5yo3yD65qKEjClpQwGy4H9YWb6SAMJC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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