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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f699383ecd6fe44188989a8af6d88086e7bec119d57ecdd32a2324e20a7d8546' 
  AND token = '3dtjxrc4G2ZIcUqdjEdBYBUwZHX6ofoc5RHkFf5o8pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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