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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c701c2d3471b4d85636625a27dd0fe50f5a1031d4adf857379248c8745182d' 
  AND token = 'jbY1i9Pez3qhvtowaRtoNsQF9PBgW/vi8omLUf9Iai0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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