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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6ca675a49106b563c0e7daf9e4015faa3f931ffadd0b889e6e8d8a90aa34ea' 
  AND token = 'Xh2jKRaRvT+ScUwlEAMBn4n/poFuy2huiHRlGQvWLTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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