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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528eadec37e2925777f790e81ed4e0a8170a529080a7af079b99fbe8e89b9a77' 
  AND token = 'HVEwHXD39rY8REkNUZxsCYmZJThwI/Jy+p1ezZ7vNqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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