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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c0092957442a02326ddbd4909d85db5bb1195c6f7835e0bf5eb62fd035cd09' 
  AND token = 'v4r09ANPVPDdFXaU1w99AEzHvJnvdyjfG9L3yXpyoBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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