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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8a929da1201eabccc4c8080536debc684690d43b38a3784aa09ebc8a9571e2' 
  AND token = '6NV688oZ7Dl7n/lo2F4NK0w/48ZHf1sC+UL7SjwMRQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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