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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209e545e718fffe729f26ad0e3f26ebfe92be2560560060c8ff8555f51c338c3' 
  AND token = 'XR21L2xUlbThf4mlhTk5L8ot0Q87xljhHiX5rGcjf/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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