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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8c7f66faf7a2b8ee8b5cab5944c84c44c123d4d71344beec46b19225a7a0b0' 
  AND token = '3h7VpByKvmbxRENd+21M1p6ZqHfdOhmjE00CdzQxZxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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