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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad6d3279f309ed8cb36c0e04be91e4a3d672da9d28ca1daef6c7b1e2d20c54a' 
  AND token = 'U9Jr02EI0xrha+/SSkDYVis9raje91e3m+t/W5nzloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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