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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a39884abb8ed8e45729e2fa17b9509fa76cc676c6c9f39f91f95ae81a23f9a8' 
  AND token = 'BHznSzxy2pj4H/fkk8VjzimQ9g6bgSSuER6kF3nyji4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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