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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ced10d0c4b0295e07148b62cf4715b68d163f0fcdca761ab317d370b627d318' 
  AND token = 'xn+QY+JTjL1cUUwEsdVWtHuzvDiBaiSnAjuWHR4PRBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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