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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74eea0d1faf5ee27781b5a60f9ff7c2092e9535ea700adcb70123703e3215df1' 
  AND token = 'vDIF7JA8VStmKcxNr99Mgjd6lIKWaim5dbAKHnGxELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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