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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fae4ee23175dfd8f98ae2359458bdc4d439651deca6013e390c2e61af102f8' 
  AND token = 'JyNqQWFblOf9aRMjrT1XWC+KuSyZ98QRs8ykQGl2MsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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