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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec68504246bdbb7ed0c0b63abec6cac06f65f9813e4810ed98dcc330375a8d82' 
  AND token = 'A8wuDR0UA2w+1VA84M6sfAWlJ93gn1RTxT49MwCJEx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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