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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01720a579384de8c0cc50fcd1a44085228e38eb0a9a83b7f7d3d71b7c52ecd2' 
  AND token = 'wa7gbgEKw9zK4Pw5osMmTYfrJsDU29owJHyf+TM2bsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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