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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f716d3f4cb886650ba2ceca66e062fa49fca3b1f548f387697e37a71554fc6' 
  AND token = 'DFs2qGGfqH75104U2cofPLWZcP9woKTQ3qQxSM4meGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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