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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef99368f95c843fd68c08e2947bbda528d57c68f9aa5c506ea4ce5087f5a03b' 
  AND token = '8Rz8hZI0p0Rmg4FZhPgpnqmJ7DW03NLdtHLptRoq5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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