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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dd6b882f997710a788aa51576c4a955cf2b519d60dd4cf59641960845d96c9' 
  AND token = 'vuJB0eNMi7odCD0aOv5cTvvjuFPARUtE51RUGyJmh6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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