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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa6c4bcce12b5fe5ca05d09b00832c647c1b90099a954146c6cdb159e2c5d14' 
  AND token = 'ySKRZI5d5/qzbhFosyi9ROXY20QmCkICsMhf7WkI9c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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