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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054d7b00d50e7cbe25aa92f53b45c5c205bbfbe1b546288842a71be71ea871e5' 
  AND token = 'BADLjq6H6dpFpSUEJRSoStpB4Kk69aQe8x52fMZfjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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