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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b632aa6a121e38a5fcdb6f6499a9c9af6dc0fc816c6873d724b38b8386d73e6a' 
  AND token = '0vmxToI9V76Rcv/qgzk4SWhPmVDtM2w3yf1ugKSdOWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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