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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee72cb5f95a71289ed4abedc33089fa8dea8222de052d29cbbe20b0f5ead7b03' 
  AND token = '5emUQ++J0KoKoPBYky82B33MPHQsz/hfvJu1vaBiq/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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