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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46916ddbf4f08b854c251fb4d485cdcdac4b6b1275dc163dce3f84446f1071b' 
  AND token = 'rJwSNac/sRiwIgVMk/S5tKf1vP+xuTx2fZ5pAbvggww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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