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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db720e0acc769288ed456701fb3f3817c4b1b53053e2748af0552dfde6c10341' 
  AND token = '4H6HPNmyHFM6XarBlFpturaA2ht7g/qcXXTBlgRMLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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