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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf37a81c0ec7c72eaaedd58f95651fd3a9dc0fcfa820e49b7fd7d24d3f5ed76' 
  AND token = 'aWZ6SYjMt+QYV3DTphwGDNKnYzWkMdtI8E+thPWm24k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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