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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da254f3c0ae7d73d6212ded0152edae556add80372c703ab2ab4ca847641eb74' 
  AND token = '6X96/sjvRwIxAELnXjzVdSiVAiCEYrR/9fwTNW05U3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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