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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dd1a2637a0c46d40f6281b3316539f32ec58b652e753c4b0eb55d351ed3217' 
  AND token = 'jqDfyLRTskrC4torJ81twf+ViEb5JUUtIXqe7qeL30A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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