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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44cf7eb706c57473db5be7790a7973096203cc8eba9ea366d4bfd4d8416f87e' 
  AND token = '0V9nBz8bU+Myr81t5Ij8nBpzeq8cX/QTl+tmQZQRIHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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