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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1e6415fad7891e36bb4004e680756b52a7c2628e72809421861d19ebeaf5c7' 
  AND token = 'hS36DZgAM+cUtnmcsE/pEjRm4I+gtXz94ZSnoAEzgVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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