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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52dfa367c7fb4f5d4d58f7ec8df89c56187c656f0952769edbb05dcccb34f62' 
  AND token = 'IQjCdHO0yp456K6E206FU6STfr3KUio/ulxix3k6uSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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