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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566c78104d906fdac818f1ca8d03cf71f17258381a133fc94cc5763f6dbea721' 
  AND token = 'W3H3poYd6gHnz3iu9yMdv9SnFVnFhxp2b0EBvFv3TMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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