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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70204c9ce769b431fd0e36691b2644f26113e1bfd077b6d2e3b7b2ffca613166' 
  AND token = 'eTSfkmOlzjeLCD54YIcZFtj3LcSmxMZ3y3K8wiI/ers=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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