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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1488166130b54de11af06761a53571637dbfc9ac360b85db7c0431f8ecd308fd' 
  AND token = 'ClJ44XIj1H24KwfPrTtLdtzknLd8SjUBEd6v99UVJtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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