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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93167810e7addf3b7a17d5e6b6caef9a537eb3a66eaff328159cb947b56ed984' 
  AND token = 'vjGhi3JfUOsiF5n40WNLH1h+FdxnYVVwIDIIp2P6nGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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