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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d230a7f87c6c8c136d503241633c302982d0e83907a925bc2df0cf4ca89005' 
  AND token = 'f91PyK6OElPcPB7AIEgpGAk/xpBD/yt4yqye7IgooG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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