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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec191563986bd8afe789b50f3099ce4fedd7620e65cf9ab81956e387a00c17a' 
  AND token = 'h4BkULKgw1eTQ9we3jolTyCyTr1YKkgz5qG2OWpXOFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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