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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da496fed6cc2a5885356eacc713000f382fd183a87e9cc643927b6ca49a514f' 
  AND token = 'PFf2eZ1O1+PNpKZ8BEiHPTXH4iaL74yG7AVy93i1IJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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