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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c9669252dec5c3a21beb478094162739bb6ed2f2a3ca206d3a614e9507560c' 
  AND token = 'BD+YXCU8VjzwHjXffemTo4+PzOEoaXTuKDeLTQQNm3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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