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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035bd8123c08894ac0d2fcb925388cf212eb5de357f2f64f900d74f3022e2047' 
  AND token = 'rUQbdvmDAOlbFo8LU9YS7W8cc5l6RgZEfZ2ZWT62Cr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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