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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad346da2b0a3c66b73de88ad702d90e204adc0593fa23b3e4314afa2eb24a062' 
  AND token = 'CSq6XEfeYKgf2lWuAY5TlbbKiJFS+Bu43YixO1n3xbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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